D311: WGU Microbiology with Lab: PA
questions with answers
Which class of cells most often contain extrachromosomal DNA found in plasmids? - correct answer:
Prokaryotic
What is the significance of the molecule that makes up the bilayer formed in the plasma membrane of
most bacterial and eukaryotic cells? - correct answer: Phospholipids help maintain hydrophobic and
hydrophilic environments.
Which microorganisms produce dermatophytes that can cause skin infections, such as athlete's foot and
ringworm? - correct answer: Fungi
Which microorganisms can produce human pathogens that spread via microsporidia? - correct answer:
Fungi
Why are archaea considered prokaryotic organisms? - correct answer: Their cells do not contain a
nucleus.
Why is MRSA more pathogenic than other strains of Staphylococcus aureus? - correct answer: MRSA has
increased antibiotic resistance.
A patient recently had an outpatient surgical procedure. After a few days at home, they noticed swelling
and redness at their incision site. How would this infection be classified? - correct answer: Iatrogenic
Which viral virulence factor requires adjustments to the influenza vaccine annually? - correct answer:
Antigenic variation
Which pair of enzymes are produced by some bacteria that causes the clotting of blood to protect the
bacteria in the bloodstream, then a digestion of the clots to allow the bacteria to spread? - correct
answer: Coagulase and kinase
, How does coinfection of a single cell by multiple strains of a virus increase it's pathogenicity? - correct
answer: Coinfection provides the opportunity for an antigenic shift.
Canned food is heated and sealed in sterile containers to provide a longer shelf life and prevent
spoilage. Improper canning results in the growth of microorganisms, which may result in food containers
that swell and explode.
Which staining technique can be used to identify these microorganisms? - correct answer: Endospore
staining
A student in a lab has just completed an endospore stain of Bacillus anthracis and realized that heat was
not applied during the staining technique.
What will the student see upon microscopic examination of the slide? - correct answer: Pink vegetative
cells with clear round areas.
A physician is given a vaginal swab in order to test for post-antibiotic vaginal infection.
Which microscopic technique would identify opportunistic fungal pathogen? - correct answer: Wet
mount stain
A technician has just performed a Gram stain but forgot to add the safranin.
What is the likely result of this when viewed microscopically? - correct answer: Gram-negative
organisms can not be seen under the microscope.
Which characteristic of mycobacterium makes a Gram stain unsuitable? - correct answer: The cell wall
has a waxy lipid.
Which feature of infection indicates the presence of a primary pathogen rather than an opportunistic
pathogen? - correct answer: Patients with healthy immune systems.
questions with answers
Which class of cells most often contain extrachromosomal DNA found in plasmids? - correct answer:
Prokaryotic
What is the significance of the molecule that makes up the bilayer formed in the plasma membrane of
most bacterial and eukaryotic cells? - correct answer: Phospholipids help maintain hydrophobic and
hydrophilic environments.
Which microorganisms produce dermatophytes that can cause skin infections, such as athlete's foot and
ringworm? - correct answer: Fungi
Which microorganisms can produce human pathogens that spread via microsporidia? - correct answer:
Fungi
Why are archaea considered prokaryotic organisms? - correct answer: Their cells do not contain a
nucleus.
Why is MRSA more pathogenic than other strains of Staphylococcus aureus? - correct answer: MRSA has
increased antibiotic resistance.
A patient recently had an outpatient surgical procedure. After a few days at home, they noticed swelling
and redness at their incision site. How would this infection be classified? - correct answer: Iatrogenic
Which viral virulence factor requires adjustments to the influenza vaccine annually? - correct answer:
Antigenic variation
Which pair of enzymes are produced by some bacteria that causes the clotting of blood to protect the
bacteria in the bloodstream, then a digestion of the clots to allow the bacteria to spread? - correct
answer: Coagulase and kinase
, How does coinfection of a single cell by multiple strains of a virus increase it's pathogenicity? - correct
answer: Coinfection provides the opportunity for an antigenic shift.
Canned food is heated and sealed in sterile containers to provide a longer shelf life and prevent
spoilage. Improper canning results in the growth of microorganisms, which may result in food containers
that swell and explode.
Which staining technique can be used to identify these microorganisms? - correct answer: Endospore
staining
A student in a lab has just completed an endospore stain of Bacillus anthracis and realized that heat was
not applied during the staining technique.
What will the student see upon microscopic examination of the slide? - correct answer: Pink vegetative
cells with clear round areas.
A physician is given a vaginal swab in order to test for post-antibiotic vaginal infection.
Which microscopic technique would identify opportunistic fungal pathogen? - correct answer: Wet
mount stain
A technician has just performed a Gram stain but forgot to add the safranin.
What is the likely result of this when viewed microscopically? - correct answer: Gram-negative
organisms can not be seen under the microscope.
Which characteristic of mycobacterium makes a Gram stain unsuitable? - correct answer: The cell wall
has a waxy lipid.
Which feature of infection indicates the presence of a primary pathogen rather than an opportunistic
pathogen? - correct answer: Patients with healthy immune systems.
